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715 lines
26 KiB
Python
715 lines
26 KiB
Python
# sqlalchemy/events.py
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# Copyright (C) 2005-2013 the SQLAlchemy authors and contributors <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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"""Core event interfaces."""
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from . import event, exc, util
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engine = util.importlater('sqlalchemy', 'engine')
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pool = util.importlater('sqlalchemy', 'pool')
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class DDLEvents(event.Events):
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"""
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Define event listeners for schema objects,
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that is, :class:`.SchemaItem` and :class:`.SchemaEvent`
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subclasses, including :class:`.MetaData`, :class:`.Table`,
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:class:`.Column`.
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:class:`.MetaData` and :class:`.Table` support events
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specifically regarding when CREATE and DROP
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DDL is emitted to the database.
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Attachment events are also provided to customize
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behavior whenever a child schema element is associated
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with a parent, such as, when a :class:`.Column` is associated
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with its :class:`.Table`, when a :class:`.ForeignKeyConstraint`
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is associated with a :class:`.Table`, etc.
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Example using the ``after_create`` event::
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from sqlalchemy import event
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from sqlalchemy import Table, Column, Metadata, Integer
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m = MetaData()
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some_table = Table('some_table', m, Column('data', Integer))
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def after_create(target, connection, **kw):
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connection.execute("ALTER TABLE %s SET name=foo_%s" %
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(target.name, target.name))
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event.listen(some_table, "after_create", after_create)
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DDL events integrate closely with the
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:class:`.DDL` class and the :class:`.DDLElement` hierarchy
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of DDL clause constructs, which are themselves appropriate
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as listener callables::
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from sqlalchemy import DDL
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event.listen(
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some_table,
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"after_create",
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DDL("ALTER TABLE %(table)s SET name=foo_%(table)s")
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)
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The methods here define the name of an event as well
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as the names of members that are passed to listener
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functions.
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See also:
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:ref:`event_toplevel`
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:class:`.DDLElement`
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:class:`.DDL`
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:ref:`schema_ddl_sequences`
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"""
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def before_create(self, target, connection, **kw):
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"""Called before CREATE statments are emitted.
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:param target: the :class:`.MetaData` or :class:`.Table`
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object which is the target of the event.
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:param connection: the :class:`.Connection` where the
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CREATE statement or statements will be emitted.
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:param \**kw: additional keyword arguments relevant
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to the event. The contents of this dictionary
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may vary across releases, and include the
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list of tables being generated for a metadata-level
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event, the checkfirst flag, and other
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elements used by internal events.
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"""
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def after_create(self, target, connection, **kw):
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"""Called after CREATE statments are emitted.
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:param target: the :class:`.MetaData` or :class:`.Table`
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object which is the target of the event.
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:param connection: the :class:`.Connection` where the
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CREATE statement or statements have been emitted.
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:param \**kw: additional keyword arguments relevant
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to the event. The contents of this dictionary
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may vary across releases, and include the
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list of tables being generated for a metadata-level
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event, the checkfirst flag, and other
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elements used by internal events.
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"""
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def before_drop(self, target, connection, **kw):
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"""Called before DROP statments are emitted.
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:param target: the :class:`.MetaData` or :class:`.Table`
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object which is the target of the event.
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:param connection: the :class:`.Connection` where the
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DROP statement or statements will be emitted.
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:param \**kw: additional keyword arguments relevant
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to the event. The contents of this dictionary
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may vary across releases, and include the
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list of tables being generated for a metadata-level
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event, the checkfirst flag, and other
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elements used by internal events.
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"""
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def after_drop(self, target, connection, **kw):
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"""Called after DROP statments are emitted.
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:param target: the :class:`.MetaData` or :class:`.Table`
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object which is the target of the event.
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:param connection: the :class:`.Connection` where the
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DROP statement or statements have been emitted.
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:param \**kw: additional keyword arguments relevant
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to the event. The contents of this dictionary
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may vary across releases, and include the
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list of tables being generated for a metadata-level
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event, the checkfirst flag, and other
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elements used by internal events.
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"""
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def before_parent_attach(self, target, parent):
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"""Called before a :class:`.SchemaItem` is associated with
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a parent :class:`.SchemaItem`.
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:param target: the target object
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:param parent: the parent to which the target is being attached.
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:func:`.event.listen` also accepts a modifier for this event:
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:param propagate=False: When True, the listener function will
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be established for any copies made of the target object,
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i.e. those copies that are generated when
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:meth:`.Table.tometadata` is used.
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"""
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def after_parent_attach(self, target, parent):
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"""Called after a :class:`.SchemaItem` is associated with
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a parent :class:`.SchemaItem`.
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:param target: the target object
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:param parent: the parent to which the target is being attached.
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:func:`.event.listen` also accepts a modifier for this event:
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:param propagate=False: When True, the listener function will
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be established for any copies made of the target object,
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i.e. those copies that are generated when
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:meth:`.Table.tometadata` is used.
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"""
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def column_reflect(self, inspector, table, column_info):
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"""Called for each unit of 'column info' retrieved when
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a :class:`.Table` is being reflected.
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The dictionary of column information as returned by the
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dialect is passed, and can be modified. The dictionary
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is that returned in each element of the list returned
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by :meth:`.reflection.Inspector.get_columns`.
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The event is called before any action is taken against
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this dictionary, and the contents can be modified.
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The :class:`.Column` specific arguments ``info``, ``key``,
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and ``quote`` can also be added to the dictionary and
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will be passed to the constructor of :class:`.Column`.
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Note that this event is only meaningful if either
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associated with the :class:`.Table` class across the
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board, e.g.::
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from sqlalchemy.schema import Table
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from sqlalchemy import event
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def listen_for_reflect(inspector, table, column_info):
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"receive a column_reflect event"
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# ...
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event.listen(
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Table,
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'column_reflect',
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listen_for_reflect)
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...or with a specific :class:`.Table` instance using
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the ``listeners`` argument::
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def listen_for_reflect(inspector, table, column_info):
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"receive a column_reflect event"
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# ...
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t = Table(
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'sometable',
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autoload=True,
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listeners=[
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('column_reflect', listen_for_reflect)
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])
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This because the reflection process initiated by ``autoload=True``
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completes within the scope of the constructor for :class:`.Table`.
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"""
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class SchemaEventTarget(object):
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"""Base class for elements that are the targets of :class:`.DDLEvents`
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events.
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This includes :class:`.SchemaItem` as well as :class:`.SchemaType`.
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"""
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dispatch = event.dispatcher(DDLEvents)
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def _set_parent(self, parent):
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"""Associate with this SchemaEvent's parent object."""
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raise NotImplementedError()
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def _set_parent_with_dispatch(self, parent):
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self.dispatch.before_parent_attach(self, parent)
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self._set_parent(parent)
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self.dispatch.after_parent_attach(self, parent)
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class PoolEvents(event.Events):
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"""Available events for :class:`.Pool`.
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The methods here define the name of an event as well
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as the names of members that are passed to listener
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functions.
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e.g.::
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from sqlalchemy import event
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def my_on_checkout(dbapi_conn, connection_rec, connection_proxy):
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"handle an on checkout event"
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event.listen(Pool, 'checkout', my_on_checkout)
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In addition to accepting the :class:`.Pool` class and
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:class:`.Pool` instances, :class:`.PoolEvents` also accepts
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:class:`.Engine` objects and the :class:`.Engine` class as
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targets, which will be resolved to the ``.pool`` attribute of the
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given engine or the :class:`.Pool` class::
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engine = create_engine("postgresql://scott:tiger@localhost/test")
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# will associate with engine.pool
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event.listen(engine, 'checkout', my_on_checkout)
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"""
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@classmethod
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def _accept_with(cls, target):
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if isinstance(target, type):
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if issubclass(target, engine.Engine):
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return pool.Pool
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elif issubclass(target, pool.Pool):
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return target
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elif isinstance(target, engine.Engine):
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return target.pool
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else:
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return target
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def connect(self, dbapi_connection, connection_record):
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"""Called once for each new DB-API connection or Pool's ``creator()``.
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:param dbapi_con:
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A newly connected raw DB-API connection (not a SQLAlchemy
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``Connection`` wrapper).
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:param con_record:
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The ``_ConnectionRecord`` that persistently manages the connection
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"""
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def first_connect(self, dbapi_connection, connection_record):
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"""Called exactly once for the first DB-API connection.
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:param dbapi_con:
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A newly connected raw DB-API connection (not a SQLAlchemy
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``Connection`` wrapper).
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:param con_record:
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The ``_ConnectionRecord`` that persistently manages the connection
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"""
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def checkout(self, dbapi_connection, connection_record, connection_proxy):
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"""Called when a connection is retrieved from the Pool.
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:param dbapi_con:
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A raw DB-API connection
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:param con_record:
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The ``_ConnectionRecord`` that persistently manages the connection
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:param con_proxy:
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The ``_ConnectionFairy`` which manages the connection for the span of
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the current checkout.
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If you raise a :class:`~sqlalchemy.exc.DisconnectionError`, the current
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connection will be disposed and a fresh connection retrieved.
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Processing of all checkout listeners will abort and restart
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using the new connection.
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"""
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def checkin(self, dbapi_connection, connection_record):
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"""Called when a connection returns to the pool.
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Note that the connection may be closed, and may be None if the
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connection has been invalidated. ``checkin`` will not be called
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for detached connections. (They do not return to the pool.)
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:param dbapi_con:
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A raw DB-API connection
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:param con_record:
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The ``_ConnectionRecord`` that persistently manages the connection
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"""
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def reset(self, dbapi_con, con_record):
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"""Called before the "reset" action occurs for a pooled connection.
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This event represents
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when the ``rollback()`` method is called on the DBAPI connection
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before it is returned to the pool. The behavior of "reset" can
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be controlled, including disabled, using the ``reset_on_return``
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pool argument.
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The :meth:`.PoolEvents.reset` event is usually followed by the
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the :meth:`.PoolEvents.checkin` event is called, except in those
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cases where the connection is discarded immediately after reset.
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:param dbapi_con:
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A raw DB-API connection
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:param con_record:
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The ``_ConnectionRecord`` that persistently manages the connection
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.. versionadded:: 0.8
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.. seealso::
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:meth:`.ConnectionEvents.rollback`
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:meth:`.ConnectionEvents.commit`
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"""
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class ConnectionEvents(event.Events):
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"""Available events for :class:`.Connectable`, which includes
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:class:`.Connection` and :class:`.Engine`.
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The methods here define the name of an event as well as the names of
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members that are passed to listener functions.
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An event listener can be associated with any :class:`.Connectable`
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class or instance, such as an :class:`.Engine`, e.g.::
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from sqlalchemy import event, create_engine
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def before_cursor_execute(conn, cursor, statement, parameters, context,
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executemany):
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log.info("Received statement: %s" % statement)
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engine = create_engine('postgresql://scott:tiger@localhost/test')
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event.listen(engine, "before_cursor_execute", before_cursor_execute)
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or with a specific :class:`.Connection`::
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with engine.begin() as conn:
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@event.listens_for(conn, 'before_cursor_execute')
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def before_cursor_execute(conn, cursor, statement, parameters,
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context, executemany):
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log.info("Received statement: %s" % statement)
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The :meth:`.before_execute` and :meth:`.before_cursor_execute`
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events can also be established with the ``retval=True`` flag, which
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allows modification of the statement and parameters to be sent
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to the database. The :meth:`.before_cursor_execute` event is
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particularly useful here to add ad-hoc string transformations, such
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as comments, to all executions::
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from sqlalchemy.engine import Engine
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from sqlalchemy import event
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@event.listens_for(Engine, "before_cursor_execute", retval=True)
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def comment_sql_calls(conn, cursor, statement, parameters,
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context, executemany):
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statement = statement + " -- some comment"
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return statement, parameters
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.. note:: :class:`.ConnectionEvents` can be established on any
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combination of :class:`.Engine`, :class:`.Connection`, as well
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as instances of each of those classes. Events across all
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four scopes will fire off for a given instance of
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:class:`.Connection`. However, for performance reasons, the
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:class:`.Connection` object determines at instantiation time
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whether or not its parent :class:`.Engine` has event listeners
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established. Event listeners added to the :class:`.Engine`
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class or to an instance of :class:`.Engine` *after* the instantiation
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of a dependent :class:`.Connection` instance will usually
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*not* be available on that :class:`.Connection` instance. The newly
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added listeners will instead take effect for :class:`.Connection`
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instances created subsequent to those event listeners being
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established on the parent :class:`.Engine` class or instance.
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:param retval=False: Applies to the :meth:`.before_execute` and
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:meth:`.before_cursor_execute` events only. When True, the
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user-defined event function must have a return value, which
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is a tuple of parameters that replace the given statement
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and parameters. See those methods for a description of
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specific return arguments.
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.. versionchanged:: 0.8 :class:`.ConnectionEvents` can now be associated
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with any :class:`.Connectable` including :class:`.Connection`,
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in addition to the existing support for :class:`.Engine`.
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"""
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@classmethod
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def _listen(cls, target, identifier, fn, retval=False):
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target._has_events = True
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if not retval:
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if identifier == 'before_execute':
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orig_fn = fn
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def wrap_before_execute(conn, clauseelement,
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multiparams, params):
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orig_fn(conn, clauseelement, multiparams, params)
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return clauseelement, multiparams, params
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fn = wrap_before_execute
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elif identifier == 'before_cursor_execute':
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orig_fn = fn
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def wrap_before_cursor_execute(conn, cursor, statement,
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parameters, context, executemany):
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orig_fn(conn, cursor, statement,
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parameters, context, executemany)
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return statement, parameters
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fn = wrap_before_cursor_execute
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elif retval and \
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identifier not in ('before_execute', 'before_cursor_execute'):
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raise exc.ArgumentError(
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"Only the 'before_execute' and "
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"'before_cursor_execute' engine "
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"event listeners accept the 'retval=True' "
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"argument.")
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event.Events._listen(target, identifier, fn)
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def before_execute(self, conn, clauseelement, multiparams, params):
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"""Intercept high level execute() events, receiving uncompiled
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SQL constructs and other objects prior to rendering into SQL.
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This event is good for debugging SQL compilation issues as well
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as early manipulation of the parameters being sent to the database,
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as the parameter lists will be in a consistent format here.
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This event can be optionally established with the ``retval=True``
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flag. The ``clauseelement``, ``multiparams``, and ``params``
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arguments should be returned as a three-tuple in this case::
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@event.listens_for(Engine, "before_execute", retval=True)
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def before_execute(conn, conn, clauseelement, multiparams, params):
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# do something with clauseelement, multiparams, params
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return clauseelement, multiparams, params
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:param conn: :class:`.Connection` object
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:param clauseelement: SQL expression construct, :class:`.Compiled`
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instance, or string statement passed to :meth:`.Connection.execute`.
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:param multiparams: Multiple parameter sets, a list of dictionaries.
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:param params: Single parameter set, a single dictionary.
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See also:
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:meth:`.before_cursor_execute`
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"""
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def after_execute(self, conn, clauseelement, multiparams, params, result):
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"""Intercept high level execute() events after execute.
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:param conn: :class:`.Connection` object
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:param clauseelement: SQL expression construct, :class:`.Compiled`
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instance, or string statement passed to :meth:`.Connection.execute`.
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:param multiparams: Multiple parameter sets, a list of dictionaries.
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:param params: Single parameter set, a single dictionary.
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:param result: :class:`.ResultProxy` generated by the execution.
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"""
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def before_cursor_execute(self, conn, cursor, statement,
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parameters, context, executemany):
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"""Intercept low-level cursor execute() events before execution,
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receiving the string
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SQL statement and DBAPI-specific parameter list to be invoked
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against a cursor.
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This event is a good choice for logging as well as late modifications
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to the SQL string. It's less ideal for parameter modifications except
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for those which are specific to a target backend.
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This event can be optionally established with the ``retval=True``
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flag. The ``statement`` and ``parameters`` arguments should be
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returned as a two-tuple in this case::
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@event.listens_for(Engine, "before_cursor_execute", retval=True)
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def before_cursor_execute(conn, cursor, statement,
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parameters, context, executemany):
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# do something with statement, parameters
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return statement, parameters
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See the example at :class:`.ConnectionEvents`.
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:param conn: :class:`.Connection` object
|
|
:param cursor: DBAPI cursor object
|
|
:param statement: string SQL statement
|
|
:param parameters: Dictionary, tuple, or list of parameters being
|
|
passed to the ``execute()`` or ``executemany()`` method of the
|
|
DBAPI ``cursor``. In some cases may be ``None``.
|
|
:param context: :class:`.ExecutionContext` object in use. May
|
|
be ``None``.
|
|
:param executemany: boolean, if ``True``, this is an ``executemany()``
|
|
call, if ``False``, this is an ``execute()`` call.
|
|
|
|
See also:
|
|
|
|
:meth:`.before_execute`
|
|
|
|
:meth:`.after_cursor_execute`
|
|
|
|
"""
|
|
|
|
def after_cursor_execute(self, conn, cursor, statement,
|
|
parameters, context, executemany):
|
|
"""Intercept low-level cursor execute() events after execution.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param cursor: DBAPI cursor object. Will have results pending
|
|
if the statement was a SELECT, but these should not be consumed
|
|
as they will be needed by the :class:`.ResultProxy`.
|
|
:param statement: string SQL statement
|
|
:param parameters: Dictionary, tuple, or list of parameters being
|
|
passed to the ``execute()`` or ``executemany()`` method of the
|
|
DBAPI ``cursor``. In some cases may be ``None``.
|
|
:param context: :class:`.ExecutionContext` object in use. May
|
|
be ``None``.
|
|
:param executemany: boolean, if ``True``, this is an ``executemany()``
|
|
call, if ``False``, this is an ``execute()`` call.
|
|
|
|
"""
|
|
|
|
def dbapi_error(self, conn, cursor, statement, parameters,
|
|
context, exception):
|
|
"""Intercept a raw DBAPI error.
|
|
|
|
This event is called with the DBAPI exception instance
|
|
received from the DBAPI itself, *before* SQLAlchemy wraps the
|
|
exception with it's own exception wrappers, and before any
|
|
other operations are performed on the DBAPI cursor; the
|
|
existing transaction remains in effect as well as any state
|
|
on the cursor.
|
|
|
|
The use case here is to inject low-level exception handling
|
|
into an :class:`.Engine`, typically for logging and
|
|
debugging purposes. In general, user code should **not** modify
|
|
any state or throw any exceptions here as this will
|
|
interfere with SQLAlchemy's cleanup and error handling
|
|
routines.
|
|
|
|
Subsequent to this hook, SQLAlchemy may attempt any
|
|
number of operations on the connection/cursor, including
|
|
closing the cursor, rolling back of the transaction in the
|
|
case of connectionless execution, and disposing of the entire
|
|
connection pool if a "disconnect" was detected. The
|
|
exception is then wrapped in a SQLAlchemy DBAPI exception
|
|
wrapper and re-thrown.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param cursor: DBAPI cursor object
|
|
:param statement: string SQL statement
|
|
:param parameters: Dictionary, tuple, or list of parameters being
|
|
passed to the ``execute()`` or ``executemany()`` method of the
|
|
DBAPI ``cursor``. In some cases may be ``None``.
|
|
:param context: :class:`.ExecutionContext` object in use. May
|
|
be ``None``.
|
|
:param exception: The **unwrapped** exception emitted directly from the
|
|
DBAPI. The class here is specific to the DBAPI module in use.
|
|
|
|
.. versionadded:: 0.7.7
|
|
|
|
"""
|
|
|
|
def begin(self, conn):
|
|
"""Intercept begin() events.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
|
|
"""
|
|
|
|
def rollback(self, conn):
|
|
"""Intercept rollback() events, as initiated by a
|
|
:class:`.Transaction`.
|
|
|
|
Note that the :class:`.Pool` also "auto-rolls back"
|
|
a DBAPI connection upon checkin, if the ``reset_on_return``
|
|
flag is set to its default value of ``'rollback'``.
|
|
To intercept this
|
|
rollback, use the :meth:`.PoolEvents.reset` hook.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
|
|
.. seealso::
|
|
|
|
:meth:`.PoolEvents.reset`
|
|
|
|
"""
|
|
|
|
def commit(self, conn):
|
|
"""Intercept commit() events, as initiated by a
|
|
:class:`.Transaction`.
|
|
|
|
Note that the :class:`.Pool` may also "auto-commit"
|
|
a DBAPI connection upon checkin, if the ``reset_on_return``
|
|
flag is set to the value ``'commit'``. To intercept this
|
|
commit, use the :meth:`.PoolEvents.reset` hook.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
"""
|
|
|
|
def savepoint(self, conn, name=None):
|
|
"""Intercept savepoint() events.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param name: specified name used for the savepoint.
|
|
|
|
"""
|
|
|
|
def rollback_savepoint(self, conn, name, context):
|
|
"""Intercept rollback_savepoint() events.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param name: specified name used for the savepoint.
|
|
:param context: :class:`.ExecutionContext` in use. May be ``None``.
|
|
|
|
"""
|
|
|
|
def release_savepoint(self, conn, name, context):
|
|
"""Intercept release_savepoint() events.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param name: specified name used for the savepoint.
|
|
:param context: :class:`.ExecutionContext` in use. May be ``None``.
|
|
|
|
"""
|
|
|
|
def begin_twophase(self, conn, xid):
|
|
"""Intercept begin_twophase() events.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param xid: two-phase XID identifier
|
|
|
|
"""
|
|
|
|
def prepare_twophase(self, conn, xid):
|
|
"""Intercept prepare_twophase() events.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param xid: two-phase XID identifier
|
|
"""
|
|
|
|
def rollback_twophase(self, conn, xid, is_prepared):
|
|
"""Intercept rollback_twophase() events.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param xid: two-phase XID identifier
|
|
:param is_prepared: boolean, indicates if
|
|
:meth:`.TwoPhaseTransaction.prepare` was called.
|
|
|
|
"""
|
|
|
|
def commit_twophase(self, conn, xid, is_prepared):
|
|
"""Intercept commit_twophase() events.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param xid: two-phase XID identifier
|
|
:param is_prepared: boolean, indicates if
|
|
:meth:`.TwoPhaseTransaction.prepare` was called.
|
|
|
|
"""
|